Free open-source planetarium. Reproduces the night sky for any date, time and location — essential for verifying star, moon and constellation positions in imagery.
Bellingcat-developed open-source web tool that constrains the geographic regions where a photographed shadow could have been cast at a given local time.
Free open-source 3D creation suite. In OSINT used for assembling reconstructions, rendering shadow simulations and aligning 3D models with reference photos.
Free open-source photogrammetry application from AliceVision that turns photo sets into 3D meshes — the entry-level tool for crowd-sourced 3D scene reconstruction.